The Oberlin Automatic Pressure Filter (APF) is a proven economical performer for most, if not all, metallic and non-metallic grinding and machining applications. Below are listed most common applications the filter has been placed in:
- Gear Grinding
- Creep Feed Grinding
- Surface Grinding
- Slot Grinding
- Tungsten Carbide
- Honing
- Machining Systems
- Piston Ring Grinding
- Bearings: race, track
- ID, OD Centerless
- Drive and Crankshafts
- Non-Metallic: fiberglass, countertops, ceramics
The basic concept of the Oberlin Pressure Filter is ‘Dirt Filters Dirt’. The idea is to pass the solids contaminated liquid coolant through a filter media. Quickly the media traps the solids and a thin layer of solids accumulates on the filter media surface. This layer produces an additional level of resistance that manifests itself as a pressure drop.
At this point most other types of filters will quit and need to have the media changed – But Not Oberlin Filter.
Once the thin layer of solids accumulates it is this solids layer that now becomes the filter media. The Oberlin Filter’s pressure capability can overcome this new resistance (pressure drop) and take advantage of the depth to attain even better solids removal efficiency without loss of flow rate. As filtration continues the solids accumulate into what is commonly called a “cake”. It is Oberlin Filter’s goal to maximize the cake thickness which in turn maximizes the time the filter is actually filtering. A longer filter cycle means less media consumption and a cleaner coolant. The pressure limit for most applications is 40 psi which is about 3-4 times more pressure than a gravity type or vacuum type filter can develop.
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The Oberlin Automatic Pressure Filter utilizing depth filtration will extend a coolants service life. Often the extension is 5-10 times.
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Filter Cakes over 90% solids by weight in typical steel grinding makes for easier disposal or may become valuable as a recyclable.
- Dry Cake Discharge results in less coolant loss from the process.
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High performance media and depth filtration typically delivers coolant with less than 10 ppm solids above 10 micron in size. That is cleaner than drinking water.
Oberlin Central Systems – For New Filtration Applications
When your need is for 100% filtration an Oberlin high-performance stand-alone system will provide you with a continual flow of the highest quality clean coolant without stopping.
How a High-Performance System Works
Dirty coolant is directed into the Oberlin dirty tank either by gravity or pump over. From there the dirty coolant is pumped into the filter where it passes through a filter media and exits the filter by gravity into the clean compartment. Excess filter flow into the clean compartment will overflow back to the dirty compartment where it will be re-filtered. When the filter pauses to dry and discharge its solids content the dirty tank will act as a buffer and store the incoming continuous dirty flow. Most systems provide two minutes of empty capacitance time in the dirty tank which is enough time to complete the drying and discharging cycles.
Oberlin Polishing Systems
For grinding and machining manufacturers that have an existing central filtration system but now have a realized need for better quality coolant.
or….
For grinding and machining manufacturers that added or upgraded their process and now have a demand for good quality coolant.
Oberlin Filter can provide an automatic pressure filter that will work as a slip stream on existing central systems. With a flow rate of 10-20% of the primary flow The Oberlin Pressure Filter will provide a high level of fine solids removal efficiency.
How a slip stream system works is the dirty coolant is pumped out of the existing filter systems dirty tank and delivered to the Oberlin Filter. After passing through the filter the clean coolant flows back to the existing dirty/clean tank or, if the polished coolant needs to be directed to a separate process a separate clean reservoir is provided to act as the clean supply. With the slipstream set up there is only the Oberlin Pressure footprint resulting in minimal floor space needs and there is very little disruption to the existing system. The bulk of the solids are discharged with the existing dragouts.
Oberlin Solids Dewatering Systems
For grinding and machining applications where the solids discharged are not dry and cannot be economically disposed of.
The Oberlin Filter can be set up to take the solids from the existing filter solid dragouts or liquid backwashes. Typically these solids are very wet and sloppy and cannot be disposed of by the usual economic means or without paying high fees.
The Oberlin System is set up much like a slipstream operation where a stand alone filter is provided along with a dirty tank used for capturing the solids and slurrying them into a consistency that can be handled by a pump. The slurry will be pumped into the filter in small batches. The filtrate is now very clean and is generally returned back to the existing filter system. The solids are discharged in a dry state suitable for landfill or recycle. This system provides an additional benefit of supplying a filtrate back to the system that is highly polished and free of most fines.
Needs and Benefits
Oberlin Filter provides the Features and Benefits to meet the manufactures specific Filtration Needs.
Need: Produce a better part
Benefits:
- Improved surface finish
- Better part size control
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Need: Reduce process costs
Benefits:
- Less tool wear
- Less wheel dressing
- Extend coolant life
- Minimize coolant losses in solids
- Minimal operator attention
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Need: Cut disposal costs
Benefits:
- Reduce disposal volume
- Reduce solids moisture
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Need: Reduce medical costs
Benefit:
- Reduces occurrences of dermatitis by removing the particulates that are the sources of bacteria growth sites
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Need: Decrease filtration costs
Benefits:
- Extended filter cycles results in less media consumption
- Recleanable filter media can eliminate disposable media costs
